Try for starters a pitch guage, Xacto knife along with 2- 1.5 mm hex (often 2 are needed for the feathering shaft removal) a 2.mm hex a 3mm hex and some angled jaw ball link pliers along with a very small phillips screw driver and a 1/8 inch flat screwdriver (Chinese likes to use cross sloted screws similar to a Phillips and a flat screw driver works well with them.
All these are common tools at any hobby shop.
You will find you buy hand tools as you go along often just to make the job at hand easier. Dremal tools along with soldering iron and jigs you can make yourself. In no time you will have drawers full of single use tools you made and bought, along with boxes of broken parts that your saving and hundreds of dollars in spare parts left over from the "old heli" you used to have...